Examines the common strategies viruses employ to infect diverse hosts as well as the unique characteristics of viral pathogenesis in the human host. Topics will include the nature of viruses, how viruses are classified, the molecular events in the infection and replication of viruses in eukaryotic cells, how viruses cause disease in humans, the host response to virus infection, and the spread and control of viruses infecting humans. Viruses infecting other organisms, including insects and plants will be examined. Prions and other subviral agents will also be discussed. This is a graduate-level course. Prerequisite: Admission to the M.S. program in biology. Three hours lecture and discussion per week. Not offered every semester.